1. Division of Applied Medicine, University of Aberdeen, Foresterhill, Aberdeen, Scotland
2. Department of Dermatology, University Medical Centre, Groningen, Groningen, the Netherlands
3. Department of Dermatology and Venereology, Medical University of Warsaw, Warsaw, Poland
4. Paula-Modersohn-Platz Freiburg, Germany
5. University of Exeter Medical School, University of Exeter, St Luke’s Campus, Exeter, England
6. Department of Dermatology, Erasmus Medical Centre, Rotterdam, the Netherlands7Department of Dermatology, Havenziekenhuis, Rotterdam, the Netherlands